diff --git a/src/griffe/loader.py b/src/griffe/loader.py
index 9012b831..223673a9 100644
--- a/src/griffe/loader.py
+++ b/src/griffe/loader.py
@@ -245,7 +245,11 @@ def expand_exports(self, module: Module, seen: set | None = None) -> None:  # no
         for export in module.exports:
             if isinstance(export, Name):
                 module_path = export.full.rsplit(".", 1)[0]  # remove trailing .__all__
-                next_module = self.modules_collection[module_path]
+                try:
+                    next_module = self.modules_collection[module_path]
+                except KeyError:
+                    logger.debug(f"Cannot expand '{export.full}', try pre-loading corresponding package")
+                    continue
                 if next_module.path not in seen:
                     self.expand_exports(next_module, seen)
                     try: